60 mL of a mixture of nitrous oxide and nitric oxide was exploded with excess of hydrogen. If 38 mL of N2 was formed, then the volume (in mL) of nitric oxide in the mixture is (all measurements are made at constant P and T) :
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Solution
Let the volume of NOandN2O be a and b mL respectively. Then, a+b=60...(i) NO+H2→12N2+H2O a mL 0 0a2 N2O+H2→N2+H2O b mL 0 0b ∴ Total N2 formed=(a2)+b=38 ...(ii) By equations (i) and (ii), a=44 mL, b=16 mL. So, volume of nitric oxide NO=44 mL.